
Using the factory holes in the inner door (no need to drill). Please tell me you have the "brain" and loom for the kit too. That motor is auxillary, its not really supposed to be used on its own, although you still can - its kind of missing the point and you'll need to stick a relay, switch and little bit of wiring in just to make it operate.
Do you currently have that type of universal central locking, or is it the factory VW stuff?